Frontiers in Chemistry
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2022
·
IF 5.545
Hu Yingzi,Xu Zhiliang,Pu Junmei,Hu Lanping,Zi You,Wang Mengke,Feng Xingmei,Huang Weichun
The bacterial accumulation at the margins of dental resin composites is a main cause of secondary caries, which may further lead to prosthodontic failure. In this regard, this study for the first time incorporated 2D MXene Ti3C2Tx nanosheets (NSs) into epoxy resin at different mass ratios (0, 0.5, 1.0, and 2.0 wt%) by solution blending and direct curing for dental applications. Compared to the pure resin, the as-fabricated MXene/resin composite not only exhibited improved mechanical and abrasive results but also displayed gradually improved antibacterial activity with MXene loading which was further enhanced by illumination in natural light due to the high photothermal efficiency of MXene. In addition, the cytotoxicity result demonstrated that the MXene-modified resin did not cause severe damage to normal cells. This novel MXene/resin nanocomposite could pave the way for new designs for high-performance, multifunctional nanocomposites to effectively protect dental health in daily life.
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JOURNAL OF NANOBIOTECHNOLOGY
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2023
·Vol. 21
·期 1
·1-11
·
IF 10.2
Wu Zhihua,Zhao De,Han Xin,Liu Jichang,Sun Ying,Li Yaogang,Duan Yourong
Background Superhydrophobic substrate modifications are an effective way to improve SERS sensitivity by concentrating analyte molecules into a small surface area. However, it is difficult to manipulate low-volume liquid droplets on superhydrophobic substrates. Results To overcome this limitation, we deposited a hydrophilic Ti 3 C 2 T x film on a superhydrophobic ZnO nanorod array to create a SERS substrate with improved analyte affinity. Combined with its interfacial charge transfer properties, this enabled a rhodamine 6G detection limit of 10 −11 M to be achieved. In addition, the new SERS substrate showed potential for detection of biological macromolecules, such as microRNA. Conclusion Combined with its facile preparation, the SERS activity of ZnO/Ti 3 C 2 T x suggests it may provide an ultrasensitive environmental pollutant-monitoring and effective substrate for biological analyte detection. Graphical Abstract
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DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 1
·201-210
·
IF 4.569
Yi Shi,Xiaolong Lu,Zhiwei Xu,Qi Wang,Huafei Guo,Jialu Jia,Bijun Fang,Ningyi Yuan,Jianning Ding
MXene film electrodes for supercapacitors, assembled with MXene nanosheets as structure units, inevitably suffer from self-restacking, which severely restrains ion transport kinetics and results in insufficient active site utilization and poor rate capability. Herein, an in situ foaming strategy employing the accumulated gas generated during the etching of sacrificial templates, combined with the confinement between the MXene film, has been proposed to fabricate pores between stacked MXene sheets and along the vertical direction of the film. The surface chemistry of the foamed film was further modified by alkali washing treatment to replace hydrophobic –F groups with hydrophilic –OH groups to improve electrolyte penetration and introduce more active sites. The resultant porous MXene film electrode exhibits a greatly improved specific capacitance (354.1 F g−1 at 5 mV s−1) and unparalleled rate capability (with a capacitance retention of 96.1% at 2000 mV s−1). This work demonstrates a facile but efficient method for the construction of porous MXene films, simultaneously providing insights into the promising applications of MXenes.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xinmeng Zhang,Yakun Li,Wanyin Ge
Dopamine (DA) is a small biological molecule that causes a variety of diseases when its concentration is abnormal. Therefore, highly sensitive detection of DA is very important for the development of biomedicine and monitoring of human health. Herein, we prepared a carbon cloth (CC)/Ti3C2Tx/NiCoP composite as a highly sensitive electrochemical sensor for DA detection. Porous NiCoP was grown on the surface of CC and Ti3C2Tx by hydrothermal and phosphating treatments. The composite integrated the advantages of large specific surface area of zero-dimensional NiCoP quantum dots, rich electrochemical active sites of one-dimensional porous NiCoP nanowires, hydrophilicity of two-dimensional Ti3C2Tx nanosheets, and high conductivity of three-dimensional CC substrates. The sensor has high sensitivity (31.4101 μA μM–1 cm–2), wide detection range (0.17–784.55 μM), low detection limit (0.18 nM), elevated stability, and anti-interference ability. By analyzing the conductivity, hydrophilicity, and electrochemically active surface area of the CC/Ti3C2Tx/NiCoP composite, the reasons for its excellent performances are revealed for DA detection. At present, the research on NiCoP mainly focuses on hydrogen evolution, oxygen evolution, and supercapacitor. This research provides a regulatory strategy for the application of phosphide materials in sensors.
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Crystals
·
2023
·Vol. 13
·期 7
·1005
·
IF 2.7
Zhiwei Liu,Guanlong Li,Yan Zhao,Xiangbao Chen
The rapid development of electronic technology has brought convenience and efficiency to the lives of modern people, while emphasizing the need for novel materials with designability and excellent dielectric properties at the same time. In this work, Ti3C2TxMXene nanosheets (MNSs) underwent NH3·H2O solvothermal treatment at temperatures of 40 °C, 60 °C, 80 °C, 100 °C, 120 °C, 140 °C, 160 °C, and 180 °C. The changes in the surface groups and dielectric properties after the solvothermal treatment were studied. The solvothermal treatment increased the proportion of surface -OH groups, which was beneficial to the permittivity of the MNSs. However, as the treating temperature increased, the amount of -OH on the surface of the MNSs showed a reducing trend, according to XPS spectra. As the treating temperature rose from 40 °C to 80 °C, the real part of the permittivity of MNS sample showed a significant decrease, eventually remaining approximately stable in the 80 °C to 180 °C samples. The results of electromagnetic characterization were in line with the group proportion, as determined via the XPS O1s spectra, supporting the previous conclusion that the -OH group played an important role in the permittivity.Keywords:NH3·H2O solvothermal;end groups;dielectric property;2D nanosheets
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Qing-Ming Wang,Zhen-Hui Liu,Qiu-Feng Lü
Traditional separation materials based on Ti 3 C 2 T x modification are susceptible to contamination by oily substances and have single performance, which limits their applications in treatment of actual oily wastewater. Here, to improve the hydrophilicity and stability of Ti 3 C 2 T x , EHL-functionalized Ti 3 C 2 T x (EHL-Ti 3 C 2 T x ) was prepared by enzymatic hydrolysis lignin (EHL) forming secondary bonds with the terminal oxygen-containing groups on the surface of Ti 3 C 2 T x . EHL-Ti 3 C 2 T x was further coated on polyurethane (PU) sponge to construct rough structures, enabling the modified EHL-Ti 3 C 2 T x @PU sponge superhydrophilic/underwater superoleophobic wettability to achieve separation efficiency above 99.5% for different oil/water mixtures. Especially, the maximum permeation flux of EHL-Ti 3 C 2 T x @PU for cyclohexane/water mixture separation is up to 231,321 L m −2 h −1 . In addition, the functionalized interface constructed by EHL- Ti 3 C 2 T x on mixed cellulose ester (MCE) membrane exhibits high permeability to malachite green and methylene blue cationic dyes with rejection rates of 99.1% and 98.1%, respectively. Therefore, two separation materials obtained by decorating EHL-Ti 3 C 2 T x on PU and MCE substrates have extremely potential in treating complex wastewater.
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CHEMOSPHERE
·
2022
·
IF 8.943
Hongwei Wang,Fang Wu,Zhiheng Wang,Yang Wang,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
Chromium (VI) removal is crucial to the safety of water resources, but there is still a lack of effective and fast dislodge methods, especially the on-site rapid remediation and emergency removal technology . Herein, the monolayer (ML) Ti 3 C 2 T x nanosheets (NSs) were prepared to remove Cr (VI) from water. The solution sample of the two-dimensional (2D) Ti 3 C 2 T x NSs demonstrate ultrafast adsorption kinetics (the concentration decreasing from 300 to 3 mg L −1 in 10 min) and impressively high capacity (1483 mg g −1 ), which is several times higher than that of the most reported Cr (VI) adsorption by Ti 3 C 2 T x . The analysis of the adsorption kinetics and isotherm models indicates that the adsorption reaction is endothermic, with physical and chemical adsorption coexisting (mainly monolayer chemical adsorption). The joint study of the experimental analysis and theoretical calculation based on the density functional theory (DFT) demonstrates that the extraordinary removal performance of Cr (VI) is due to the synergetic effect of reduction reaction removal and electrostatic adsorption. It is found that the Cr (VI) is mainly reduced by the OH- terminals on Ti 3 C 2 , and the detoxified Cr (III) is anchored on the surface of Ti 3 C 2 T x through complexation reaction with O terminal. The advantages of ultrafast adsorption kinetics and extra-high adsorption capacity of the single-layered Ti 3 C 2 T x for Cr (VI) removal make it a remarkable candidate for rapid and urgent removal of Cr (VI) wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Beibei Yang,Guoli Zhang,Jiayu Dong,Shaochun Tang,Lifang Zhang,Zhengguang Wu,Duan Bin,Yaqiong Song,Hongbin Lu
A conducting and anticorrosive coating is crucial for the application of metal bipolar plates (BP) in proton exchange membrane fuel cell (PEMFC). In this work, a Ti 3 C 2 T x (T)-carbon black (C)-acrylic epoxy (AE) coating is prepared on 304 stainless steel (SS) with enhanced corrosion resistance and conductivity. The corrosion resistance of the T-C-AE coating is investigated in a 0.5 M H 2 SO 4 solution as compared to the AE, T, and T-AE coatings. The T-C-AE coated 304SS exhibits the strongest corrosion resistance with the most positive corrosion potential and the lowest corrosion current density of 0.00673 μA cm −2 in all the samples, while retaining intact and compact surface morphology with the lowest metal ion dissolution even after immersed for 720 h. The addition of Ti 3 C 2 T x and carbon black into the AE matrix greatly decreases interfacial contact resistance (ICR), and the T-C-AE coating achieves a low ICR of 15.5 mΩ cm −2 under 140 N cm −2 compaction force . The excellent anticorrosion performance is mainly attributed to the physical barrier and the cathodic protection provided by the stacked Ti 3 C 2 T x (MXene) nanosheets in the T-C-AE coating. This eco-friendly, conducting, and anticorrosive T-C-AE coating has a good application prospect on SS BP of PEMFC.
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Advanced Materials Technologies
·
2022
·Vol. 7
·期 12
·2200158
·
IF 8.856
Weijia Liu,La Li,Chuqiao Hu,Di Chen,Guozhen Shen
The delamination of 2D Ti 3 C 2 T x MXene endows the injection of various ions and small organic molecules into its layers, thus leading to a tunable distance between layers and adjustable electrochemical properties. A suitable selection of intercalators needs to be considered according to the relevant metal-ion-based energy storage device because of the different radii of metal ions such as Li + , Na + , Mg 2+ Zn 2+ , etc. Herein, the intercalation of N , N -dimethylacetamide (DMAC), acetonitrile (ACN), dimethyl sulfoxide (DMSO), LiCl (H 2 O) into Ti 3 C 2 T x cathodes and their electrochemical performance comparisons by fabricating Zn-ion microsupercapacitors (MSCs) is reported. Studies found that an increased calculated interlayer space of 3.42, 7.47, 7.79, 8.3 Å is obtained for the H 2 O, DMSO, ACN, DMAC intercalated Ti 3 C 2 T x cathodes, and a decreased calculated binding energy of −0.03, −0.78, −1.91, and −3.06 eV is obtained for the Ti 3 C 2 T x -H 2 O, Ti 3 C 2 T x -DMSO, Ti 3 C 2 T x -ACN, and Ti 3 C 2 T x -DMAC, respectively. The highest interlayer space, lowest binding energy, and amide groups make the DMAC intercalated Ti 3 C 2 T x - based MSC exhibit volumetric capacitance of 1873 F cm −3 at a scan rate of 5 mV s −1 , much higher than 1103 F cm −3 for Ti 3 C 2 T x -H 2 O, 1313 F cm −3 for Ti 3 C 2 T x -ACN, 544 F cm −3 for Ti 3 C 2 T x -DMSO. The superior flexibility that results in invariable capacitance under 5000 bending cycles, together with the lighting test of the fabricated MSC, demonstrates its application in the wearable integrated system.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Rong Luo,Zhenyu Li,Ruixiang Li,Chunli Jiang,Ruijuan Qi,Mengqin Liu,Hechun Lin,Rong Huang,Chunhua Luo,Hui Peng
It is meaningful to search high-efficient and inexpensive electrocatalysts for hydrogen evolution reaction (HER) due to the energy crisis and environmental pollution. Here, we report the preparation of ultrafine Ru nanoparticles from a hybrid of ZIF-L(Co) MOF and polydopamine coated few-layered Ti 3 C 2 T x MXene (FL-Ti 3 C 2 T x ). FL-Ti 3 C 2 T x is used as a template to grow regular leaf-shaped ZIF-L(Co) nanosheets through the reaction of Co ions anchored on the MXene surface with 2-methylimidazole. The obtained hybrid is then doped with Ru ions through ion exchange between Ru and Co ions, followed by thermal annealing at a temperature of 350 °C in an Ar atmosphere to produce ultrafine Ru nanoparticles. The obtained Ru@ZIF-L(Co)/FL-Ti 3 C 2 T x nanocomposite shows outstanding HER performance with a low overpotential of 16.2 mV at a current density of 10 mA cm −2 , a small Tafel slope of 21.0 mV dec −1 and excellent stability in 1.0 M KOH solution. This work provides a new strategy for the design and synthesis of highly efficient HER catalyst via MOFs with tunable composition and structure.
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CHEMICAL PHYSICS
·
2022
·
IF 2.552
Ying Lv,Kai Wang,Dongyang Li,Ping Li,Xuelian Chen,Weiwei Han
MXene has gradually become hot photocatalyst in recent years due to its unique properties. This work successfully synthesized rare Ag-doped partial etched Ti 3 C 2 T x /Ti 3 AlC 2 composite nanosheets via a reduction process. The obtained ternary Ti 3 C 2 T x /Ti 3 AlC 2 @Ag can be deemed a promising photocatalyst in photodegradation fields. Ti 3 C 2 T x /Ti 3 AlC 2 @Ag-50 exhibited excellent catalytic degradation performance towards methylene blue (MB), Rhodamine B (RhB) and methylene orange (MO), with the obtained degradation efficiency of 99.7%, 98.9% and 99.3%, respectively. Furthermore, there is a synergistic effect between Ag nanoparticles and partial etched Ti 3 C 2 T x /Ti 3 AlC 2 nanosheets, as demonstrated by the transfer of photogenerated carriers and the generation of reactive oxygen species, which can improve the catalytic degradation performance of the three organic dye molecules.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Dingyuan Zheng,Wenrui Yao,Ce Sun,Xiaojian Chen,Zanru Wang,Baiwang Wang,Haiyan Tan,Yanhua Zhang
Frequent oil-spill accidents have posed serious threats to ecosystem balance and the efficiency of resources use. Hydrophobic adsorbents that can adsorb and recover oil without causing secondary pollution are ideal candidates for the remediation of oil contamination in water. However, these composites are inefficient for crude oil-spills cleanup because crude oil has low liquidity of at room temperature. Increasing the temperature can effectively enhance the flowability of crude oil. To achieve efficient crude-oil heating and removal in situ, wood aerogels were immersed in Ti 3 C 2 T x suspensions and then coated with polydimethylsiloxane (PDMS) to obtain a solar-heated adsorbent (PT-WA). The prepared PT-WA exhibits super-hydrophobicity (water contact angle: 154° ± 2°), mechanical robustness (withstanding 20 loading-unloading cycles under 50% strain without structural damage), strong solar absorption, and favorable photothermal-conversion capability (rising to ~85 °C within 90 s under 1.5 sun). Owing to these advantages, PT-WA is an effective adsorbent for crude oil cleanup. In addition, a ‘self-heating crude oil collector’ was assembled for the fast adsorption and restoration of crude oil from the water surface. This solar-assisted self-heating sorbent offers a competitive platform for the cleanup and recycling of viscous crude oil spills.
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